Another vote for the UltraDot "family." Quality, value, warranty, reputation.
I've had three of their plain-Jane 25mm tube sights, and have been impressed. I still own two (one was sold in a time of financial hardship). One of my UDs is about 25 years old, and I'm still using it.
I have no personal experience with any reflex-style sights. I'd like to get one, and when I do, the relevant UltraDot offering will certainly get a good look from me.